Question

Desenvolva o quadrado da soma e depois reduza os termos semelhantes .
A) (x+4)2 + x2 - 7 x
B)(x+3)2+(x+5)2+4x+10
Me ajudem pfvv
Obrigada!!

Answer 1

a

( x + 4)² + x² - 7x=

[ (x)² + 2 * x * 4 + (4)²] + x² - 7x =

x² + 8x + 16 + X² - 7x =

2X² + x + 16 = 0

b

( x + 3)² + ( x + 5)² + 4x + 10 =

[ (x)² + 2 * x * 3 + (3)²] + [ (x)² + 2 * x * 5 + (5)² ] + 4x + 10 =

x² +6x + 9 + x² + 10x + 25 + 4x + 10 =

2x²+ 20x + 44 *****

Answer 2

A)
= (x + 4)^2 + x^2 - 7x
= x^2 + 2.4.x + 4^2 + x ^2 - 7x
= x^2 + 8x + 16 + x^2 - 7x
= 2x^2 + x + 16

B)
= (x + 3)^2 + (x + 5)^2 + 4x + 10
= x^2 + 2.3.x + 9 + x^2 + 2.5.x + 25 + 4x + 10
= x^2 + 6x + 9 + x^2 + 10x + 25 + 4x + 10
= 2x^2 + 20x + 44