Question

(y+5) (y+5) - 10y is equal to
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Answer 1

Answer: y=3

y=-3

y=1

y=-1

y=0

Answer 2

Answer:

(y+5) (y+5) - 10y

=[y+5]^2-10y

by the law [a+b]^2=a^2+2ab+b^2

=y^2+2[5][y]+5^2 - 10y

=y^2+10y+25-10y

=y^2+25

=y^2+5^2