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Whakaroha
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Tohaina

x\left(900-60x+x^{2}\right)-4000
Whakamahia te ture huarua \left(a-b\right)^{2}=a^{2}-2ab+b^{2} hei whakaroha \left(30-x\right)^{2}.
900x-60x^{2}+x^{3}-4000
Whakamahia te āhuatanga tohatoha hei whakarea te x ki te 900-60x+x^{2}.
x\left(900-60x+x^{2}\right)-4000
Whakamahia te ture huarua \left(a-b\right)^{2}=a^{2}-2ab+b^{2} hei whakaroha \left(30-x\right)^{2}.
900x-60x^{2}+x^{3}-4000
Whakamahia te āhuatanga tohatoha hei whakarea te x ki te 900-60x+x^{2}.