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n200080 [17]
2 years ago
5

Work out the value of a2-4a when a = 10

Mathematics
2 answers:
olga2289 [7]2 years ago
7 0

\huge  \sf ༆ Answer ༄

Let's solve ~

\qquad \sf  \dashrightarrow \:  {a}^{2}  - 4a

Now, substitute a for 10

\qquad \sf  \dashrightarrow \: ( {10}^{2} )  - (4 \times 10)

\qquad \sf  \dashrightarrow \: 100 - 40

\qquad \sf  \dashrightarrow \: 60

vlabodo [156]2 years ago
5 0

<em>Question:</em><em> </em><em>Work </em><em>out </em><em>the </em><em>value </em><em>of </em><em>a²</em><em> </em><em>-</em><em> </em><em>4</em><em>a</em><em> </em><em>when </em><em>(</em><em>a </em><em>=</em><em> </em><em>1</em><em>0</em><em>)</em>

<em>To </em><em>find:</em><em> </em><em>Value </em><em>of </em><em> </em><em>a²</em><em> </em><em>-</em><em> </em><em>4</em><em>a</em><em> </em><em>=</em><em> </em><em>?</em><em> </em>

<em>Solution</em><em>:</em><em> </em>

The hint provided us to solve the question is that the value of a tends to 10 i.e (a = 10) so just we have to replace the value of a = 10 in the given equation.

Substituting value of a = 10 in eqn,

\mapsto\sf{ {a}^{2}  - 4a}

\mapsto\sf{( {10}^{2} ) - 4(10)}

\mapsto\sf{100 - 4(10)}

\mapsto\sf{100 - 40}

\mapsto\sf{60}

  • The value of equation is <u>6</u><u>0</u>
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Answer:

x = -8

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Step-by-step explanation:

Remark

In any question like this, there are 8 possible answers. Of the 8, 4 are acute angles and 4 are obtuse. So any pair are either equal to each other, or they are supplementary. In this case the two given angles are equal.

We have a little bit of both in this question.

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===================

Check

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<XCE = 180 - (-24 + 174)

<XCE = 180 - (150)

<XCE = 30

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