Download App

Algebraic Expressions and Identities — MATHS STD 8 — Question

Gujarat BoardEnglish MediumSTD 8MATHSAlgebraic Expressions and Identities1 Mark
MCQ
Product of $6a^2 - 7b + 5ab$ and $2ab$ is:
  • A
    $12a^3b - 14ab^2 + 10ab$
  • ✓
    $12a^3b - 14ab^2 + 10a^2b^2$
  • C
    $6a^2 - 7b + 7ab$
  • D
    $12a^2b - 7ab^2 + 10ab$
✓

Answer

Correct option: B.
$12a^3b - 14ab^2 + 10a^2b^2$
B.  $12a^3b - 14ab^2 + 10a^2b^2$
Solution:
Required product $= 2ab × (6a^2 - 7b + 5ab)$
This is the product of a trinomial by a monomial, so we multiply monomial with each term of the trinomial.
$= 2ab \times (6a^2 - 7b + 5ab) = 2ab \times 6a^2 + 2ab(-7b) + 2ab \times 5ab$
$= 12a^3b - 14ab^2 + 10a^2b^2$

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 "M.C.Q. [1 Marks Each]" from Algebraic Expressions and Identities→Algebraic Expressions and Identities — all question types→MATHS STD 8 question papers→Gujarat Board STD 8 question papers→Gujarat Board question paper generator→

Similar questions

Tick $(\checkmark)$ the correct answer in the following:$x \%$ of $y$ is $y \%$ of$?$
→
If $64 y 8$ is exactly divisible by 3 , then the least value of $y$ is
→
The value of $\left(5^6+5^9\right) \times 5^{-5}$ is equal to
→
Tick $(\checkmark)$ the correct answer in the following: $0.05$ is what percent of $20$?
→
The number of like terms in $\frac{1}{4}\text{a}^2\text{bc},-\frac{2}{3}\text{bca}^2,\frac{2}{5}\text{ba}^2\text{c}-\frac{1}{2}\text{cba}^2$ is:
→
Sarita draws a ball from a bag that contains 5 red and 6 yellow balls, the probability of choosing a yellow ball, is
→
Tick $(\checkmark)$ the correct answer: $1 - 2ab - (a^2+ b^2) = ?$
→
If the simple interest on a sum of money at $5 \%$ per annum for 3 years is ₹ 1200 then the compound interest on the same sum for the same period at the same rate will be
→
$(-1)^{51}$ is equal to:
→
$\left(2 x^2+3 x+1\right) \div(x+1)=?$
→