Question

(x + 2)2 + 8(x - 1)(x + 1) =9x² + 116хэлп​

Answer 1

$(x + 2)^2 + 8(x - 1)(x + 1) =9x^2 + 116\\x^2+4x+4+8x^2-8=9x^2+116\\4x=120\\x=30$

Answer 2

Sure, I can help you simplify the given expression:

(x + 2)^2 + 8(x - 1)(x + 1)

First, let's expand the terms within the parentheses:

(x + 2)^2 = (x + 2)(x + 2) = x^2 + 4x + 4

Next, expand the second part:

8(x - 1)(x + 1) = 8(x^2 + x - x - 1) = 8(x^2 - 1) = 8x^2 - 8

Now, let's combine the two expanded expressions:

(x + 2)^2 + 8(x - 1)(x + 1) = x^2 + 4x + 4 + 8x^2 - 8

Now, combine like terms:

= x^2 + 8x^2 + 4x - 8 + 4

= 9x^2 + 4x - 4

So, the simplified expression is 9x^2 + 4x - 4.