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y=x^{2}-250x+15625+125
Whakamahia te ture huarua \left(a-b\right)^{2}=a^{2}-2ab+b^{2} hei whakaroha \left(x-125\right)^{2}.
y=x^{2}-250x+15750
Tāpirihia te 15625 ki te 125, ka 15750.