Question

show that:
(4x+5)²-80=(4x-5)²
​

Answer 1

ANSWER:

(4X + 5)² - 80 = (4X - 5)²

(A + B)² = A² + B² +2AB

16X² +25 + 2(4X)(5) - 80 = 16X² + 25 - 2(4X)(5)

16X² + 25 + 40X - 80 =  16X² + 25 - 40X

16X² + 25 - 16X² - 25 + 40X + 40X = 80

80X = 80

X = 80÷80

X = 1

VERIFICATION:

(4×1 + 5)² - 80 = (4×1 - 5)²

16 + 25 + 40 -80 = 16 +25 - 40

16 + 25 + 40 + 40 - 80 = 16 +25

16 + 25 = 16 + 25

BYE

#BRAINLY

#IRSHAD