book Maths Puzzle Numerical Ability

Please help with this.

Decide all values of b that will give one or more real number solutions.

5x^2 + bx + 1 = 0

Thank You!

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book Other Question

Simplify the radical. Assume that all variables represent positive real numbers.

√6a +5√150a -4√216a

A) 2√372a
B) 1√372a
C) 2√6a
D) 1√6a I am having difficulty completing my last 8 exams in Algebra II - can someone please help me! Thank you so much.