Question

x2+25x+144 factorise

Answer 1

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Answer 2

Question should be:

• Factorise x²+25x+144

ANSWER:

• Factorisation of the above expression is (x+9)(x+16)

GIVEN:

• x²+25x+144

TO FIND:

• Factorisation of the above expression.

SOLUTION:

= x²+25x+144

= x²+16x+9x+144

= (x²+9x)+(16x+144)

= x(x+9)+16(x+9)

= (x+9)(x+16)

Factorisation of the above expression is (x+9)(x+16)

NOTE:

Some important formulas:

(a+b)² = a²+b²+2ab

(a-b)² = a²+b²-2ab

(a+b)(a-b) = a²-b²

(a+b)³ = a³+b³+3ab(a+b)

(a-b)³ = a³-b³-3ab(a-b)

a³+b³ = (a+b)(a²+b²-ab)

a³-b³ = (a-b)(a²+b²+ab)

(a+b)² = (a-b)²+4ab

(a-b)² = (a+b)²-4ab