use suitable identity to solve (7x- 5y)2-25y2
Answers
Answered by
0
Answer:
49x^2-70xy
Step-by-step explanation:
(7x- 5y)^2-25y^2
(7x- 5y)^2-(5y)^2
(7x-5y-5y)(7x-5y+5y) {a^2-b^2=(a-b) (a+b)}
(7x-10y)(7x+0y)
(7x-10y)(7x)
7x×7x-10y×7x
49x^2-70xy
Answered by
0
Answer:
Factors are 7x and 7x - 10y
Step-by-step explanation:
(7x - 5y)² - 25y² [a² - b² = (a+b)(a-b)]
(7x - 5y)² - (5y)²
(7x - 5y + 5y) (7x - 5y - 5y)
(7x) (7x - 10y)
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