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1.x=-1
x^2-1/5
=1-1/5
=4/5
2.x=y=0
x^2+y^2-10
=0+0-10
=-10
3.9a×4ab×-2a
=-72a^2 b
6.(x+2)(x+9)
=x(x+9)+2(x+9)
=x^2+9x+2x+18
=x^2+11x+18
7.(x+2)(x+a)
=x(x+a)+2(x+a)
=x^2+ax+2x+2a
2a=6
a=3
8.(x-y)^2
=x^2-2xy+y^2
=x^2+y^2-2xy
=57-16×2
=57-32
=25
(x-y)^2=25
(x-y)=√25
=+5 or -5
pls mark my answer as brainliest if it helps you.
sorry i couldn't answer some of them
x^2-1/5
=1-1/5
=4/5
2.x=y=0
x^2+y^2-10
=0+0-10
=-10
3.9a×4ab×-2a
=-72a^2 b
6.(x+2)(x+9)
=x(x+9)+2(x+9)
=x^2+9x+2x+18
=x^2+11x+18
7.(x+2)(x+a)
=x(x+a)+2(x+a)
=x^2+ax+2x+2a
2a=6
a=3
8.(x-y)^2
=x^2-2xy+y^2
=x^2+y^2-2xy
=57-16×2
=57-32
=25
(x-y)^2=25
(x-y)=√25
=+5 or -5
pls mark my answer as brainliest if it helps you.
sorry i couldn't answer some of them
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