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Coordinate Geometry
Question
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Write the following cubes in expanded form:
(2a - 3b)3

Answer

(2a - 3b)3
(2a - 3b)3 = (2a)3 - (3b)3 - 3(2a)(3b)(2a - 3b)
| Using Identity VII = 8a3 - 27b3 - 18ab(2a - 3b)
= 8a3 - 27b3 - 36a2b + 54ab2

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Some More Questions From Coordinate Geometry Chapter

Which of the following expressions are polynomials in one variable and which are not? State reasons for your answer.

4x2 - 3x + 7

Which of the following expressions are polynomials in one variable and which are not? State reasons for your answer.

x10+ y3 + t50

Write the coefficients of x2 in each of the following:

2 + x2 + x

Write the coefficients of x2 in each of the following:
2 - x2 + x3