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Coordinate Geometry
Question
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Write the following cubes in expanded form:
(2x + 1)3

Answer

(2x + 1)3
(2x + 1)3 = (2x)3 + (1)3 + 3(2x)(1)(2x + 1)
| Using Identity VI
= 8x3 + 1 + 6x(2x + 1)
= 8x3 + 1 + 12x2 + 6x
= 8x3+ 12x2 + 6x + 1

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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