9th Math Factorisation 1 (2N)

b² + 8b + 7

• (b + 7) (b + 1)

• (b - 7) (b + 1)

• (b + 7) (b - 1)

• (b - 7) (b - 1)

Answer explanation

ax² + bx + c

b² + 8b + 7 (a=1)

2 numbers added = b

7 + 1 = 7

Same numbers multiplied = c

7 * 1 = 7

b² - 8b + 7

• (b + 7) (b + 1)

• (b - 7) (b + 1)

• (b + 7) (b - 1)

• (b - 7) (b - 1)

Answer explanation

ax² + bx + c

b² - 8b + 7 (a = 1)

2 numbers added = b

-7 + -1 = -8

Same numbers multiplied = c

(-7) (-1) = +7

b² – 6b – 7

• (b + 7) (b + 1)

• (b - 7) (b + 1)

• (b + 7) (b - 1)

• (b - 7) (b - 1)

Answer explanation

ax² + bx + c

b² - 6b - 7 (a = 1)

2 numbers added = b

-7 + 1 = -6

Same numbers multiplied = c

(-7) (1) = –7

n² − 11n + 10

• (b – 10) (b – 1)

• (b + 10) (b – 1)

• (b – 10) (b + 1)

• (b + 10) (b + 1)

Answer explanation

ax2 + bx + c

n² − 11n + 10 (a = 1)

2 numbers added = b

-10 + -1 = -10

Same numbers multiplied = c

(-10) (-1) = +10

n² − 9n - 10

• (b – 10) (b – 1)

• (b + 10) (b – 1)

• (b – 10) (b + 1)

• (b + 10) (b + 1)

Answer explanation

ax2 + bx + c

n² − 9n - 10 (a = 1)

2 numbers added = b

-10 + 1 = -9

Same numbers multiplied = c

(-10) (1) = -10

n² + 9n - 10

• (b – 10) (b – 1)

• (b + 10) (b – 1)

• (b – 10) (b + 1)

• (b + 10) (b + 1)

Answer explanation

ax2 + bx + c

n² + 9n - 10 (a = 1)

2 numbers added = b

10 – 1 = +9

Same numbers multiplied = c

(10) (–1) = -10

n² + 4n - 12

• (n – 2) (b + 6)

• (n + 2) (n - 6)

• (b – 3) (b + 4)

• (b + 3) (b - 4)

Answer explanation

ax² + bx + c

n² + 4n - 12 (a = 1)

2 numbers added = b

6 – 2 = +4

Same numbers multiplied = c

(6) (–2) = -12

n² + n - 12

• (n – 2) (b + 6)

• (n + 2) (n - 6)

• (b – 3) (b + 4)

• (b + 3) (b - 4)

Answer explanation

ax² + bx + c

n² + n - 12 (a = 1)

2 numbers added = b

-3 + 4 = +1

Same numbers multiplied = c

(-3) (4) = -12

n² - 4n - 12

• (n – 2) (b + 6)

• (n + 2) (n - 6)

• (b – 3) (b + 4)

• (b + 3) (b - 4)

Answer explanation

ax² + bx + c

n² + n - 12 (a = 1)

2 numbers added = b

-6 + 2 = -4

Same numbers multiplied = c

(-6) (2) = -12

n² - 7n + 12

• (n + 2) (b + 6)

• (n + 2) (n - 6)

• (b – 3) (b - 4)

• (b + 3) (b + 4)

Answer explanation

ax² + bx + c

n² - 7n + 12 (a = 1)

2 numbers added = b

-3 - 4 = -7

Same numbers multiplied = c

(-3) (-4) = +12