Identities

 $Expansion\ of\ \left(x\ +4\right)^2\ is\$  

•  $x^2+8x+16$  

• x $x^2+8x+4$  

•  $x^2-8x+16$  

•  $x^2+8x-16$  

If a+b=7, ab = 10, find a² + b²

• 28

• 29

• 30

• 27

Expand (x−4)².

• x² −8x+16

• x² −8x−16

• x² +8x+16

• x² −16

If area of the triangle is 24 ( x²yz + xy²z + xyz²) and its length is 8xyz, then its breadth is ?

• 3(x + y + z)

• 3xyz

• 3(x + y - z)

• none

The square of x² - 2y² is ______

• x⁴ - 4x²y² + 4y⁴
• x⁴ + 4x²y² + 4y⁴
• x⁴ - 4x²y² - 4y⁴
• None of the above

Using identity find 201 x 199

• 3000

• 3999

• 39999

• 31111

(p - q)²

• p² + 2pq + q²

• p² + 2pq - q²

• p² - 2pq - q²

• p² - 2pq + q²

 $\left(4a+2b\right)^2=$ 

•  $16a^2+8ab-4b^2$  

•  $16a^2-8ab-4b^2$  

•  $16a^2-8ab+4b^2$ 

•  $16a^2+8ab+4b^2$ 

(x² - y²) × (x² + y²) = ______

• 2x² + 2y²
• x⁴ - y⁴
• x⁴ + y⁴
• 2x⁴

Expand (3x − 2)².

• 3x² − 12x − 4

• 3x² − 12x + 4

• 9x² − 12x + 4

• 9x² − 12x − 4