Please solve question no.a.

Dear Student, For equal roots we know that in ax2+bx+c = 0 D = b2-4ac= 0 so herem+12-4×4+m×1= 0 m2-2m-15= 0 m2-5m+3m-15 = 0 mm-5+3m-5= 0 m-5m+3= 0 m = 5,-3regards

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