Question

$factorise \: x ^{2} - 21 \times 90$
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Answer 1

Answer:

x²- 21×90

= x²-1890

= x²-(√1890)²

by a²-b²= (a+b)(a-b)

=(x+√1890)(x-√1890)

Answer 2

hope it helps

peace*-*