Скачать или смотреть POLYNOMIALS-EX-2.3-Q28, Q29, Q30 AND Q31- NCERT MATHS EXEMPLAR SOLUTIONS-CLASS-9

POLYNOMIALS-EX-2.3-Q28, Q29, Q30 AND Q31- NCERT MATHS EXEMPLAR SOLUTIONS-CLASS-9

EX-2.3

Question 28:
Expand the following
(i) (4a-b + 2c)2 (ii) (3a – 5b – c)2 (iii) (-x + 2y- 3z)2

Question 29:
Factorise the following
(i) 9x2 + 4y2 + 16z2 +12xy -16yz -24xz
(ii) 25x2 + 16y2 + 4z2 – 40xy + 16yz – 20xz
iii) 16x2 + 4y2 + 9z2 – 16xy – 12yz + 24xz

Question 30:
If a + b + c = 9 and ab + bc + ca = 26, find a2 + b2 +c2.

Question 31:
Expand the following


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