Find the product: -5a(7a - 2b) - Vidyadip

Question

Find the product:
$-5a(7a - 2b)$

✓

Answer

To find the product, we will use distributive law as follows:
$-5a(7a - 2b) $
$= (-5a) × 7a + (-5a) × (-2b)$
$ = (-5 × 7) × (a × a) + (-5 × (-2)) × (a × b) $
$= (-35) × (a^{1+1}) + (10) × (a × b) $
$= -35a^2+ 10ab $
Thus, the answer is $-35a^2+ 10ab$

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 "3 Marks Question" 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

In a class, $60\%$ of the total number of students are boys and there are $14$ girls. How many students are there in the class$?$

A work-force of $420$ men with a contractor can finish a certain piece of work in $9$ months. How many extra men must he employ to complete the job in $7$ months?

Find the smallest number by which 256 must be multiplied to obtain a perfect cube.

The daily earnings (in rupees) of $24$ stores in a market was recorded as under:
$715, 650, 685, 550, 573, 530, 610, 525, 742, 680, 736, 524, 500, 585, 723, 545, 532, 560, 580, 545, 625, 630, 645, 700.$
Prepare a frequency table taking equal class sizes. One such class is $500-550$, where $550$ is not included.

If $5^{2 x+1} \div 25=125$, find the value of $x$.

By what number should $(-15)^{-1}$ be ddivded so that the quotient may be equal to $(-15)^{-1}?$

Find Cl on a sum of ₹ 8000 for 2 yr at 5% per annum compounded annually.

Find the value of $x$, so that:
$(-2)^3 \times(-2)^{-6}=(-2)^{2 x-1} $

The difference between the compound interest and simple interest on a certain sum for $2$ years at $7.5\%$ per annum is $Rs. 360.$ Find the sum.

Find three consecutive odd numbers whose sum is $147$.