Answer:
Please check the explanation.
Step-by-step explanation:
Given
f(x) = 3x + x³
Taking differentiate



solving






now solving




Thus, the expression becomes


Thus,
f'(x) = 3 + 3x²
Given that f'(x) = 15
substituting the value f'(x) = 15 in f'(x) = 3 + 3x²
f'(x) = 3 + 3x²
15 = 3 + 3x²
switch sides
3 + 3x² = 15
3x² = 15-3
3x² = 12
Divide both sides by 3
x² = 4



Thus, the value of x will be:

Can u explain it a little more clearly...
Answer:
Total no. of houses = 140
Step-by-step explanation:
Let there are 9x flats and 5x bungalows.
Total bungalows = 50
It means,
5x = 50
x = 10
No of flats = 9x
= 9(10)
= 90
Total houses = no. of flats + no. of bungalows
= 50+90
= 140
So, there are 140 houses in the village.
Answer:
you can fit 1000 hairs in 10 cm
Step-by-step explanation:


Answer:
<h2>
<em><u>Irrational</u></em><em><u> </u></em><em><u> </u></em></h2>
Step-by-step explanation:
<em><u>Firstly</u></em><em><u>, </u></em>
According to rational and irrational,

<em><u>Since</u></em><em><u>,</u></em>
Natural numbers, Whole Numbers and Integers all come under <em><u>Rational</u></em><em><u> </u></em><em><u>number</u></em><em><u>.</u></em>
<em><u>Hence</u></em><em><u>,</u></em>
<em><u>
</u></em>
<em><u>Is</u></em><em><u> </u></em><em><u>an</u></em><em><u> </u></em><em><u>irrational</u></em><em><u> </u></em><em><u>number</u></em><em><u>. </u></em>