State true or false:
$a^{2} + a = 90$ , then $a$ is $10$ or $9$ .

True

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False

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Solution

The correct option is B False
$a^{2} + a = 90$
$a^{2} + 10 a - 9 a - 90 = 0$
$(a + 10) (a - 9) = 0$
$a = - 10, 9$

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Similar questions

a_{1}, a_{2}, a_{3} \in + R

(a_{1} + a_{2} + a_{3}) (\frac{1}{a_{1}} + \frac{1}{a_{2}} + \frac{1}{a_{3}}) \geq 9

(\frac{a}{2} - \frac{b}{3}) (\frac{a}{2} + \frac{b}{3})

\frac{a^{2}}{4} - \frac{b^{2}}{9}

(2 + a) (2 - a)

4 - a^{2}

State True or False:
Cot(90 - A) = CotA

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