Factorise:2a²-14a+28
genius3862:
please answer this
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can u write question again
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2a^2-14a+28. =0
2(a^2-7a+14) =0
a^2-7a+14=0
∆=b^2-4ac
(-7)^2 -4(1)(14)
49-56
-7
∆<0
roots are imaginary
it can't be factorised
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