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ICSE Class 9 Answered

a^6 - 7a^3 - 8 a^3 - 27b^3 +2a^2b + 6ab^2 1029 - 3x^3
Asked by shweta45gaikwad | 01 Jul, 2018, 12:25: PM
answered-by-expert Expert Answer
begin mathsize 16px style We space have space straight a to the power of 6 space minus space 7 straight a cubed space minus space 8. Let space straight a cubed space equals space straight x rightwards double arrow straight x squared space minus space 7 straight x space minus space 8 space equals space 0 rightwards double arrow left parenthesis space straight x space minus space 8 right parenthesis space left parenthesis straight x space plus space 1 right parenthesis space equals space 0 rightwards double arrow left parenthesis space straight x space minus space 8 right parenthesis space equals space 0 space or space left parenthesis straight x space plus space 1 right parenthesis space equals space 0 rightwards double arrow straight x space equals space 8 space or space straight x space equals space minus 1 since comma space straight a cubed space equals space straight x space if space straight x space equals space minus 1 space rightwards double arrow space straight a cubed space equals negative 1 space rightwards double arrow space straight a space equals space minus 1 and space if space straight x space equals space 8 space rightwards double arrow straight a cubed space equals space 8 space rightwards double arrow straight a space equals space 2 end style
Answered by Yasmeen Khan | 02 Jul, 2018, 04:26: PM

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