Factorise: 9x2 - 3x - 20 - Vidyadip

Question

Factorise:
9x² - 3x - 20

✓

Answer

9x² - 3x - 20
= 9x² - 15x + 12x - 20
= 3x(3x - 5) + 4(3x - 5)
= (3x - 5)(3x + 4)

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 Marks Questions" from Factorisation of Polynomials→Factorisation of Polynomials — all question types→Maths STD 9 question papers→Gujarat Board STD 9 question papers→Gujarat Board question paper generator→

Similar questions

Find the value of k, if x – 1 is a factor of 4x³ + 3x² – 4x + k.

Simplify the following expression:

$(\sqrt{3}+\sqrt{7})^2$

A metallic sphere of radius 10.5cm is melted and thus recast into small cones, each of radius 3.5cm and height 3cm. Find how many cones are obtained.

Represent the following numbers on the number line:
$7, 7.2,\frac{-3}{2},\frac{-12}{5}$

Show that:
$\frac{\Big(\text{a}+\frac{1}{\text{b}}\Big)^\text{m}\times\Big(\text{a}-\frac{1}{\text{b}}\Big)^\text{n}}{\Big(\text{b}+\frac{1}{\text{a}}\Big)^\text{m}\times\Big(\text{b}-\frac{1}{\text{a}}\Big)^\text{n}}=\Big(\frac{\text{a}}{\text{b}}\Big)^{\text{m}+\text{n}}$

Write in decimal form and state what kind of decimal expansion: $\frac{3}{{13}}$

Solve the equation 2x +1 = x - 3, and represent the solution(s) on the number line.

Find the value to three place of decimals of each of the following. It is given that $\sqrt2=1.414,\ \sqrt3=1.732,\ \sqrt5=2.236,\ \sqrt10=3.162.$
$\frac{\sqrt5+1}{\sqrt{2}}$

There are 50 students in a class, of which 40 are boys. The average weight of the class is 44kg and that of the girls is 40kg. Find the average weight of the boys.

Factorise:
25x²+ 4y² + 9z² - 20xy - 12yz + 30xz.