Class - 9th, Ex - 2.5, Q 8 (POLYNOMIALS) Maths NCERT CBSE
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Ex - 6 Lines and angles - • Video
Ex - 7 Angles - • Video
Ex - 8 Quadrilaterals - • Video
Ex - 9 Area of Parallelogram and Triangles - • Class 9th , Ex - 9 ( A...
Ex - 10 Circles - • Class 9th , Ex - 10 Th...
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a+b ka whole cube to a cube + b cube + 3ab ( a+b) hota hai n
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Bhaiya kya hum -3(3)² ke jagah -3 × 3² like sakte h kya
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Factorise : (A) 9a2 + 25b2 + 49c2
-30ab + 70bc - 42ac
(B) 16x2 - 40x + 25
(A) 9a2+25b2+49c2
= (-3a)2 +(5b)2 +(7c)2 +2×(-3a)×5b+2×5b×7c+2×7c×(-3a)
= (-3a +5b +7c )2
= (-3a + 5b + 7c ) (-3a + 5b + 7c)
This is formula
(a+b+c)2 = a2 + b2 + c2 +2ab + 2bc +2ac
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Yes