Chapter 10: Q 10.36 (page 1172)

Solve the equation by completing square method.
$d^{2} + 10 d = - 9$

Short Answer

Expert verified

The solutions are $d = - 1, d = - 9$ .

Step by step solution

Given Information

The Given equation is $d^{2} + 10 d = - 9$ .

Isolate the variable terms on one side and the constant terms on the other.

The variable terms are on the left side.

$d^{2} + 10 d = - 9$

Here $b = 10$

So,

$= {(\frac{1}{2} b)}^{2} = {(\frac{1}{2} \times 10)}^{2} = {(5)}^{2} = 25$

Add $25$ to both sides.

$d^{2} + 10 d + 25 = - 9 + 25 d^{2} + 10 d + 25 = 16$

Factor the perfect square trinomial as a binomial square.

$(d + 5)^{2} = 16$

Use the square root property.

$d + 5 = \pm \sqrt{16} d + 5 = \pm 4$

Solve for d.

$d = - 5 \pm 4$

Rewrite to show two solutions.

$d = - 5 + 4 = - 1 d = - 5 - 4 = - 9$

Thus, the solutions are $d = - 1, d = - 9$ .

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Solve the equation by completing square method.
$d^{2} + 10 d = - 9$

Short Answer

Step by step solution

Given Information

Isolate the variable terms on one side and the constant terms on the other.

Factor the perfect square trinomial as a binomial square.

Solve for d.

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Solve the equation by completing square method. d2+10d=-9

Short Answer

Step by step solution

Given Information

Isolate the variable terms on one side and the constant terms on the other.

Factor the perfect square trinomial as a binomial square.

Solve for d.

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Math Textbooks

Probability and Statistics

Calculus

Applied Mathematics

Mechanics Maths

Logic and Functions

Geometry

Study anywhere. Anytime. Across all devices.

Solve the equation by completing square method.
$d^{2} + 10 d = - 9$