Expand the following:(a + 3b)^2 - Vidyadip

Question

Expand the following$:(a + 3b)^2$

✓

Answer

Using $(x + y)^2$
$= x^2 + 2xy + y^2, $
we get $(a + 3b)^2$
$= a^2+ 2(a)(3b) + (3b)^2$
$= a^2 + 6ab + 9ab^2.$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "[2 Mark Question Answer]" from Expansions→Expansions — all question types→MATHEMATICS STD 9 question papers→ICSE Board STD 9 question papers→ICSE Board question paper generator→

Similar questions

The marks obtained by 7 students in a group are 340, 180, 260, 164, 56, 275 and 307 respectively. Find the mean marks per student.

Draw the graph of : y = 4

Prove that:
$\cos^2 30^\circ - \sin^2 30^\circ = \cos 60^\circ$

Express the following as a single logarithm :
$2 \log _{10} 8+\log _{10} 36-\log _{10}(1.5)-3 \log _{10} 2$

The weights of 7 boys in a group are 52 kg, 57 kg, 55 kg, 60 kg, 54 kg, 59 kg and 55 kg. Find the mean weight of the group.

Use property to evaluate : $7^3+ 3^3+ (-10)^3$

Solve for $x : \cos^2 30^\circ+ \cos^2 x = 1$

If $\left(a^2+\frac{1}{a^2}\right)=23$, find the values of : $\left(a+\frac{1}{a}\right)$

Draw the graph of : 2y - 7 = 0

Two circles of radii 17 cm and 25 cm intersect each other at two points A and B . If the length of common chord $A B$ of the circles be 30 cm , find the distance between the centres of the circles.