How do you multiply $(7x-5y)^2$ ?

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Answer 1 · 2016-09-15T10:38:15

$=49*x^2-70*x*y+25*y^2$

$...............(7x-5y) *(7x-5y)$

$................=49*x^2-35*x*y -35*x*y+25*y^2$

$................=49*x^2-70*x*y+25*y^2$

Answer 2 · 2016-09-15T20:23:57

$49x^2-70xy+25y^2$

Write as: $color(blue)((7x-5y))color(brown)((7x-5y))$

Multiply everything inside the right brackets by everything in the left brackets.

Notice that the minus follows the $color(blue)(-5y)$

$color(brown)(color(blue)(7x)(7x-5y)" "color(blue)(-5y)(7x-5y))$

$49x^2-35xy" "-35xy+25y^2$

$49x^2-70xy+25y^2$

How do you multiply (7x-5y)^2(7x-5y)^2?