22. x2 +7xy-60y2
25. a2-ay-210y2.
28. x2 +16x-260.
31. a4-a²b2-5664
factorise
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Answer:
22. x2+7xy-60y2
= x2+12xy-5xy-60y2
= x(x+12y)-5y(x+12y)
= (x-5y)(x+12y)
25. a2-ay-210y2
= a2-15ay+14ay-210y2
= a(a-15y)+14y(a-15y)
= (a+14y)(a-15y)
28. x2+16x-260
= x2+26x-10x-260
= x(x+26)-10(x+26)
= (x-10)(x+26)
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