Advertisements
Advertisements
प्रश्न
If a + b = 5 and a2 + b2 = 13, then ab = ?
विकल्प
12
6
5
13
MCQ
Advertisements
उत्तर
6
Explanation;
Hint: (a + b)2 = 25
13 + 2ab = 25
2ab = 12
ab = 6
shaalaa.com
क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
APPEARS IN
संबंधित प्रश्न
Use a suitable identity to get the following products.
(− a + c) (− a + c)
Of which of the binomials given below is m2n2 + 14mnpq + 49p2q2 the expansion?
Use the formula to multiply the following.
`(x/5+6)(x/5-6)`
Use the formula to find the value.
98 × 102
`(("a" + "b")("a"^3 - "b"^3))/(("a"^2 - "b"^2))` = ___________
Factors of 9x2 + 6xy are
Factorise the following using suitable identity
36m2 + 60m + 25
(a + b)2 = a2 + b2
Factorise the following, using the identity a2 + 2ab + b2 = (a + b)2.
x2 + 6x + 9
Verify the following:
(a + b)(a + b)(a + b) = a3 + 3a2b + 3ab2 + b3
