Factorise 8x^3 + 343
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11
(2x)^3 + 7^3
Using identity: a^3 + b^3 = (a + b)(a^2 - ab + b^2
a = 2x
b = 7
(2x + 7)(4x^2 - 14x + 49).
Answered by
5
8x^3 + 343 = 0
8x^3 = -343
x^3 = -343/8
x = - 7 / 2
Pls mark the answer brainliest
8x^3 = -343
x^3 = -343/8
x = - 7 / 2
Pls mark the answer brainliest
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