If X + Y = 9, Xy = 20 Find: X2 - Y2.

If x + y = 9, xy = 20
find: x² - y².

योग

x + y = 9, xy = 20
We know (x - y) (x + y)
= x² - y²
⇒ x² - y²
= (±1) (9)
= ±9.

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अध्याय 4: Expansions - Exercise 4.1

अध्याय 4 Expansions
Exercise 4.1 | Q 8.2

Write the following cube in expanded form:

(2x + 1)³

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Find the following product:

(4x − 5y) (16x² + 20xy + 25y²)

If x + y + z = 8 and xy +yz +zx = 20, find the value of x³ + y³+ z³ −3xyz

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If a² + b² + c² − ab − bc − ca =0, then

Use the direct method to evaluate the following products:
(5a + 16) (3a – 7)

If a - b = 10 and ab = 11; find a + b.

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