Substituting Values into Equations and Expressions

Work out the value the expression when

e = 3, f = 2, g = -4 and h = -2.

3 (e + f)

Work out the value the expression when e = 3, f = 2, g = -4 and h = -2. 3(e + f) - 5 (e - f)

Work out the value the expression when

e = 3, f = 2, g = -4 and h = -2.

h (2f + g)

Work out the value the expression when

e = 3, f = 2, g = -4 and h = -2.

(ef)/h - g

Find all the solutions to each equation. x(x-1)=0 (5-x)(5+x)=0 (2x+1)(x+8)=0 (3x-3)(3x-3)=0 (7-x)(x+4)=0

• x=0 and x=1

• x=±5

• x=−1/2 and x=−8

• x=1

• x=7 and x=−4

Jada is working on solving a quadratic equation. She thinks that her solution is correct because substituting 5 for p in the original expression p^2- 5p gives 25-25 or 0. Explain the mistake that Jada made and show the correct solutions.

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A piecewise function, p, is defined by this rule: p(x)=x-1, x≤−2; 2x-1, x>−2. Find the value of p at each given input.

• p(-20)=-21

• p(-2)=-3

• p(4)=7

• p(5.7)=10.4

Please solve this equation

^p/₅ = 7

• p = 35

• p = 12

• p = 2

• None of these match my answer

Please solve this equation

23 = x + 7

• x = 16

• x = 30

• x = 161

• None of these match my answer

Please solve this equation

1.2x = 9.6

• x = 8

• x = 10.8

• x = 8.4

• None of these match my answer