Question

6. Simplify:
i) (a + b)(5a – 3b) + (a – 3b)(a – b)
ii) (a – b) (a2 + b2 + ab) – (a + b) (a2 + b2 – ab)
iii) (b2 – 49) (b + 7) + 343
7. Verify the following:
i) (ab + bc) (ab – bc) + (bc + ca) (bc – ca) + (ca + ab) (ca – ab) = 0
ii) (a + b + c) (a2 + b2 + c2 – ab – bc – ca) = a3 + b3+ c3 – 3abc
iii) (p – q) (p2 + pq + q2) = p3 – q3

Answer 1

Hey, These seems to be too booring to calculate and simplify. Because I use to think this. But you have to do it. In higher classes you will not get any difficulty.

If it helps then plz mark me as brainliest