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1-PY7. Ifp = 4-9, prove that p'+48. If a + b = 8 and a2 + b2 = 40 find the value of a3 + b32 nrove that 83-863 - 36ab = 27. |
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Answer» (a+b)^2=a^2 +b^2 +2ab(8)^2= 40+2ab64=40+2ab64-40=2ab24= 2ab24÷2=ab12=ab(a+b)^3= a^3+ b^3+3ab (a+b)(8)^3= a^3+b^3+3*12(a+b)(8)^3= a^3+b^3+ 36(a+b)(8)^3=a^3+b^3+36*8(8)^3=a^3+b^3+288(8)^3-288=a^3+b^3512-288=a^3+b^3224=a^3+b^3 |
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