Quadratic equation
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In mathematics, a quadratic equation is an equation that can be rearranged in standard form as a x 2 + b x + c = 0, where the variable x represents an unknown number, and a, b, and c represent known n
La Jolla Cove cliff diving 02
Golden ratio
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In mathematics, two quantities are in the golden ratio if their ratio is the same as the ratio of their sum to the larger of the two quantities. Expressed algebraically, for quantities a and b with a
Quadratic equation
…of the discriminant, that is when the two roots are very close. This can lead to loss of up to half of correct significant figures in the roots. The golden ratio is found as the positive solution of the quadratic equation x 2 − x − 1 = 0. The equations of the circle and the other conic sections—ellipses, parabolas…
Michael Maestlin, the first to write a decimal approximation of the ratio
Dan Shechtman demonstrates quasicrystals at the NIST in 1985 using a Zometoy model.
Da Vinci's illustration of a dodecahedron from Pacioli's Divina proportione (1509)
Detail of the saucer plant, Aeonium tabuliforme, showing the multiple spiral arrangement (parastichy)