Question

Expand the following using identity
a) (x + 7)?
b) (x+6) (x - 6)​

Answer 1

Answer:

a)x= -7

b) x²-6²=x²-36

x=√36

x=6

Answer 2

Step-by-step explanation:

a. (x+ 7) it may be (x+7)^2

then we will use the formula i.e., (a+b)^2 = a^2 + b^2+ 2ab

now it will be

x^2 + 7^2 + 2(x) (7)

x^2 + 49 + 14x

x^2 + 14x + 49

b. Here we will use (a+b) (a-b) = a^2 - b^2

i.e.,

x^2 - (6)^2

x^2 - 36

hope it helps