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Post a LessonAnswered on 19 Jul Learn CBSE - Class 9/Class 9 Mathematics/Chapter 2 Polynomials/EXERCISE - 2.3
Parneet
Experienced Maths Tutor . MSc Mathematics. 3 + year experience.
Answered on 11 Jul Learn CBSE - Class 9/Class 9 Mathematics/Chapter 2 Polynomials/EXERCISE - 2.2
Rinsha V P
Answered on 11 Aug Learn CBSE - Class 9/Class 9 Mathematics/Chapter 2 Polynomials/EXERCISE - 2.3
Sanjeev Verma
Answered on 31 Jul Learn CBSE - Class 9/Class 9 Mathematics/Chapter 2 Polynomials/EXERCISE - 2.3
Satyansh Singh
Answered on 11 Aug Learn CBSE - Class 9/Class 9 Mathematics/Chapter 2 Polynomials/EXERCISE - 2.4
Sanjeev Verma
in this question we will use the identity
(ax + b) * (cx + d) = ac*x^2 + (ad + bc)* x + bd
(1) (x + 4) (x + 10) = x^2 + (4 + 10)*x + 4 * 10
=x^2 + 14x + 40
(2) (x +8) (x - 10) = x^2 + (8 - 10)x + 8 * -10
= x^2 - 2x - 80
(3)(3x + 4) (3x - 5) = (3x)^2 + (4*3 + (- 5)*3) * x + 4 * (-5)
= 9x^2 - 3x - 20
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