Question

simplify 6. (x + 6)(x - 6)

Answer 1

\[ (a+b)(a-b) = a^2-b^2 \]
gives
\[ (x+6)(x-6) = x^2-6^2 = x^2-36 \]

Answer 2

x^2 - 6^2
x^2 - 36

Answer 3

7. (2x - 7)2

Answer 4

\[ (2x-7)*2 = 2x*2-7*2 = 4x-14 \]

Answer 5

(2x)^2 - 2(2x)(7) + (7)^2
4x^2 -28x + 49

Answer 6

u use (a - b)^2 = a^2 - 2ab + b^2

Answer 7

8. (2x + 5)(3x - 7)