(5x +7 y)²- (5x- 7y)²
Answers
Answered by
1
Answer:
25x²+70xy+49y²-(25x²+49y²-70xy)
+140xy
Answered by
2
Answer:
(5x+7y)²-(5x-7y)²= a²-b²
{(5x+7y)+(5x-7y)} {(5x+7y)-(5x-7y)= (a+b)(a-b)
{5x+7y+5x-7y}{5x+7y-5x+7y}
{5x+5x}{7y+7y}
{10x}{14y}
140xy
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