Advertisements
Advertisements
प्रश्न
Using identities, evaluate 297 × 303
Advertisements
उत्तर
297 × 303 = (300 − 3) × (300 + 3)
= (300)2 − (3)2 [(a + b) (a − b) = a2 − b2]
= 90000 − 9 = 89991
shaalaa.com
या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
संबंधित प्रश्न
Using identities, evaluate (5.2)2
Using (x + a) (x + b) = x2 + (a + b) x + ab, find 9.7 × 9.8
Use an expansion formula to find the value.
(997)2
Use the formula to find the value.
98 × 102
Expand:
(2a – 3b)2
Expand:
`("p"/3 + "q"/4)^2`
Show that (x + 2y)2 – (x – 2y)2 = 8xy
Factorise the following, using the identity a2 + 2ab + b2 = (a + b)2.
x2 + 14x + 49
If a + b = 25 and a2 + b2 = 225, then find ab.
Verify the following:
(a + b)(a + b)(a + b) = a3 + 3a2b + 3ab2 + b3
