Advertisements
Advertisements
प्रश्न
Using (x + a) (x + b) = x2 + (a + b) x + ab, find 9.7 × 9.8
उत्तर
9.7 × 9.8 = (10 − 0.3) (10 − 0.2)
= (10)2 + [(− 0.3) + (− 0.2)] (10) + (− 0.3) (− 0.2)
= 100 + (− 0.5)10 + 0.06 = 100.06 − 5 = 95.06
APPEARS IN
संबंधित प्रश्न
Use a suitable identity to get the following products
(2a − 7) (2a − 7)
Use a suitable identity to get the following products.
(7a − 9b) (7a − 9b)
Using identities, evaluate 992
Using identities, evaluate 8.92
Use an expansion formula to find the value.
(1005)2
`(("a" + "b")("a"^3 - "b"^3))/(("a"^2 - "b"^2))` = ___________
Factorise the following, using the identity a2 + 2ab + b2 = (a + b)2.
a2x2 + 2ax + 1
Factorise the following.
p2 + 14p + 13
The area of a rectangle is x2 + 7x + 12. If its breadth is (x + 3), then find its length.
Take suitable number of cards given in the adjoining diagram [G(x × x) representing x2, R(x × 1) representing x and Y(1 × 1) representing 1] to factorise the following expressions, by arranging the cards in the form of rectangles: x2 + 4x + 4. Factorise 2x2 + 6x + 4 by using the figure.
Calculate the area of figure.
