Download App

Polynomials — Maths STD 9 — Question

Gujarat BoardEnglish MediumSTD 9MathsPolynomials1 Mark
Question
Use suitable identity to find the product: $(3 x+4)(3 x-5)$
✓

Answer

$(3 x+4)(3 x-5)$
$=(3 x+4)\{3 x+(-5)\}$
$\left\{\right.$ Using identity $\left.(x+a)(x+b)=x^2+(a+b) x+a b\right\}$
$=(3 x)^2+\{4+(-5)\}(3 x)+(4)(-5)$
$=9 x^2-3 x-20$

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 "1 Marks Question" from Polynomials→Polynomials — all question types→Maths STD 9 question papers→Gujarat Board STD 9 question papers→Gujarat Board question paper generator→

Similar questions

A hemi spherical bowl has a radius of $3.5\ cm.$ What would be the volume of water it would contain$?$
→
Express the following decimals in the form $\frac{\text{p}}{\text{q}}:$
$0.39$
→
Express the following decimals in the form $\frac{\text{p}}{\text{q}}:$
$2.15$
→
Factorise the following:
$9 y^2-66 y z+121 z^2$
→
Find the surface area of a sphere of radius 14 cm.
→
Write the value of $\left\{5\left(8^{1 / 3}+27^{1 / 3}\right)^3\right\}^{1 / 4}$.
→
Classify the following number as rational or irrational. give reasons to support your answer. $\sqrt{1.44}$
→
Find the surface area of a sphere of radius: $5.6\ cm$
→
There exist at least three points that are not on the same line. Does the postulate contain any undefined term? Is this postulate consistent? Does this follow from Euclid’s postulates? Explain.
→
Without actually calculating the cube, find the value of $(28)^3+(-15)^3+(-13)^3$
→