21. Factorise the expression and divide it as directed:
39y3 (50 y2 - 98) = 26y2 (5y +7)
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Answer:
39y
3
(50y
2
−98)÷26y
2
(5y+7)
=
26y
2
(5y+7)
39y
3
(50y
2
−98)
=
26y
2
(5y+7)
39y
3
(5×5×2y
2
−7×7×2)
=
26y
2
(5y+7)
39y
3
×2(5y)
2
−(7)
2
=
26y
2
(5y+7)
39y
3
×2(5y+7)(5y−7)
=3y(5y−7)
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