Mam obliczyć y korzystając ze wzorów skróconego mnożenia
(x-2)(x+2)-(x-2)² = -y
x²₋4₋(x²₋4x₊4)=⁻y
x²₋x²₊4x₋4=⁻y
4x₋4=₋y
y=4₋4x
y=4(1₋x)
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(x-2)(x+2)-(x-2)² = -y
x²₋4₋(x²₋4x₊4)=⁻y
x²₋x²₊4x₋4=⁻y
4x₋4=₋y
y=4₋4x
y=4(1₋x)