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| 1. |
p²+2p-(q+1)(q-1) (2-9q)factorise it |
| Answer» TION:(q+1)(q-1) = q²-1p²+2p-(q²-1) = p²+2p-q²+1 = p²+2p+1 -q²Since p²+2p+1 = (p+1)²p²+2p-(q²-1) = (p+1)²-q²Considering a =(p+1) and b=q => a²-b²= (a-b) (a+b)p²+2p-(q²-1) = (p+1)²-q² = (p+1-q)(p+1+q)After REARRANGING,:.p²+2p-(q²-1) = (p-q+1)(p+q+1) | |