![factorise \: x ^{2} - 21 \times 90 factorise \: x ^{2} - 21 \times 90](https://tex.z-dn.net/?f=factorise+%5C%3A+x+%5E%7B2%7D++-+21+%5Ctimes+90)
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Answered by
2
Answer:
x²- 21×90
= x²-1890
= x²-(√1890)²
by a²-b²= (a+b)(a-b)
=(x+√1890)(x-√1890)
Answered by
3
hope it helps
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