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Whakaroha
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Tohaina

4\left(x^{2}-10x+25\right)-4\left(x-5\right)-5
Whakamahia te ture huarua \left(a-b\right)^{2}=a^{2}-2ab+b^{2} hei whakaroha \left(x-5\right)^{2}.
4x^{2}-40x+100-4\left(x-5\right)-5
Whakamahia te āhuatanga tohatoha hei whakarea te 4 ki te x^{2}-10x+25.
4x^{2}-40x+100-4x+20-5
Whakamahia te āhuatanga tohatoha hei whakarea te -4 ki te x-5.
4x^{2}-44x+100+20-5
Pahekotia te -40x me -4x, ka -44x.
4x^{2}-44x+120-5
Tāpirihia te 100 ki te 20, ka 120.
4x^{2}-44x+115
Tangohia te 5 i te 120, ka 115.
4\left(x^{2}-10x+25\right)-4\left(x-5\right)-5
Whakamahia te ture huarua \left(a-b\right)^{2}=a^{2}-2ab+b^{2} hei whakaroha \left(x-5\right)^{2}.
4x^{2}-40x+100-4\left(x-5\right)-5
Whakamahia te āhuatanga tohatoha hei whakarea te 4 ki te x^{2}-10x+25.
4x^{2}-40x+100-4x+20-5
Whakamahia te āhuatanga tohatoha hei whakarea te -4 ki te x-5.
4x^{2}-44x+100+20-5
Pahekotia te -40x me -4x, ka -44x.
4x^{2}-44x+120-5
Tāpirihia te 100 ki te 20, ka 120.
4x^{2}-44x+115
Tangohia te 5 i te 120, ka 115.