Advertisements
Advertisements
प्रश्न
Using identities, evaluate 78 × 82
Advertisements
उत्तर
8 × 82 = (80 − 2) (80 + 2)
= (80)2 − (2)2 [(a + b) (a − b) = a2 − b2]
= 6400 − 4 = 6396
shaalaa.com
या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
संबंधित प्रश्न
Use a suitable identity to get the following products.
(1.1m − 0.4) (1.1 m + 0.4)
Which of the options given below is the square of the binomial `(8-1/"x")`?
Use the formula to find the value.
97 × 103
`(("a" + "b")("a"^3 - "b"^3))/(("a"^2 - "b"^2))` = ___________
If a + b = 10 and ab = 18, find the value of a2 + b2
Factorise the following using suitable identity
a2 + 6ab + 9b2 – c2
Factorise the following.
y2 + 18x + 65
Factorise the following.
y2 + 7y + 12
Verify the following:
(7p – 13q)2 + 364pq = (7p + 13q)2
Factorise p4 + q4 + p2q2.
